Simple Mail Transfer Protocols (SMTP)

The application  layer  protocols  for electronic  mail is SMTP( Simple mail  transfer protocols).

Internet  electronic  mail  has many components  including mail services  that house user  mailboxes   mail  readers that allow  users to read and write messages a standard for  defining the structure of an e mail message  and application layer protocols. Thais  define  how  messages are passed between  servers, how  message are  passed between  servers and mail  readers, and how the  contents  of certain parts  of the mail  message ( for example  a mail message header) are to be interpreted.